Power amplifier circuit and multi-stage power amplifier circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsYuuma NOGUCHI, Kiichiro TAKENAKA
Life of this patent
Estimating the term…
Abstract
A power amplifier circuit includes a first line having one end connected to an input terminal and the other end; a second line having one end connected to the other end of the first line and the other end connected to ground, the second line being electromagnetically coupled to the first line; and a transistor having an emitter or source connected to the other end of the first line, a base or gate supplied with a bias and connected via a first capacitor to ground, and a collector or drain connected to a power supply terminal and an output terminal.
Claims7
A power amplifier circuit comprising:
- a first line having a first end connected to an input terminal;
- a second line having a first end connected to a second end of the first line, and a second end connected to ground, the second line being electromagnetically coupled to the first line;
- and
- a transistor having an emitter or source connected to the second end of the first line, a base or gate supplied with a bias and connected via a first capacitor to ground, and a collector or drain connected to a power supply terminal and to an output terminal.
A multi-stage power amplifier circuit comprising:
- a plurality of power amplifier circuits connected in series to form a plurality of stages,
- wherein the power amplifier circuit of an initial stage is connected to an input terminal and is a common-base amplifier circuit or a common-gate amplifier circuit;
- and
- wherein the power amplifier circuit of the initial stage comprises:
- a first line having a first end connected to the input terminal,
- a second line having a first end connected to a second end of the first line, and a second end connected to ground, the second line being electromagnetically coupled to the first line, and
- a transistor having an emitter or source connected to the second end of the first line, a base or gate supplied with a bias and connected via a first capacitor to ground, and a collector or drain connected to a power supply terminal and to the power amplifier circuit of a stage subsequent to the initial stage.
Dependencies are inferred from the claim text.